Even what is deemed to be the greatest of human minds can't concieve beyond a certain point. The greatest mind (in my opinion) leaves 'self' out of the equation and just thinks about what there is (or might be) and tries their best to work with that...

Razzberries! I have an Underwood with glass sides, a Royal 12 pica Canterbury Elite, 4 fountain pens and an Eberhardt No. 2 - unsharpened! They all work. At least I think the pencil does, I've not sharpened it to find out. (And, yes, the pens all leak.)